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DeltaABC , is right angles at C. If p is...

`DeltaABC `, is right angles at C. If p is thhe length of the perpendicular from C to AB and a,b,c are the lengths of the sides opposites `angle A,angle B,angle C `respectively then prove that
`1/(p^(2))=1/(a^(2))+1/(b^(2))`

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